import java.util.List;

import org.apache.maven.api.model.InputLocation;

/**
 * Collects problems that are encountered during model building. The primary purpose of this component is to account for
 * the fact that the problem reporter has/should not have information about the calling context and hence cannot provide

        }

        return pluginManager.getMojoDescriptor(
                plugin, goal, project.getRemotePluginRepositories(), session.getRepositorySession());
    }

    // TODO take repo mans into account as one may be aggregating prefixes of many
    // TODO collect at the root of the repository, read the one at the root, and fetch remote if something is missing
    // or the user forces the issue

    // In this case, both the verify and the report goals are called
    // in a different lifecycle. Though the compiler-plugin has a valid use case, although
    // that seems to work fine. We need to take versions and lifecycle into account.
    public ProjectSorter(Collection<MavenProject> projects) throws CycleDetectedException, DuplicateProjectException {
        graph = new Graph();

        // groupId:artifactId:version -> project

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.versioning.OverConstrainedVersionException;

/**
 * Specific problems during resolution that we want to account for:
 * <ul>
 *   <li>missing metadata</li>
 *   <li>version range violations</li>
 *   <li>version circular dependencies</li>
 *   <li>missing artifacts</li>
 *   <li>network/transfer errors</li>

    // 5) Execute AbstractLifecycleParticipant.afterSessionStart(session)
    //
    // 6) Get reactor projects looking for general POM errors
    //
    // 7) Create ProjectDependencyGraph using trimming which takes into account --projects and reactor mode.
    // This ensures that the projects passed into the ReactorReader are only those specified.
    //

            return value == null || value.isEmpty();
        }

        /**
         * Returns a comparable value for a qualifier.
         * <p>
         * This method takes into account the ordering of known qualifiers then unknown qualifiers with lexical
         * ordering.
         * <p>
         *
         * @param qualifier

                testPlugin = plugin;
            }

            Integer count = validPluginCounts.get(pluginArtifactId);

            assertEquals(0, (int) count, "Multiple copies of plugin: " + pluginArtifactId + " found in POM.");

            count = count + 1;

            validPluginCounts.put(pluginArtifactId, count);
        }

        assertNotNull(testPlugin);

     * @param root the root node of the dependency graph
     * @param count estimated number of dependencies
     */
    DefaultDependencyResolverResult(List<Exception> exceptions, Node root, int count) {
        this.exceptions = exceptions;
        this.root = root;
        nodes = new ArrayList<>(count);
        paths = new ArrayList<>(count);
        dispatchedPaths = new LinkedHashMap<>();

 * <p>
 * This builder uses a number of threads equal to the minimum of the degree of concurrency (which is the thread count
 * set with <code>-T</code> on the command-line) and the number of projects to build. As such, building a single project
 * will always result in a sequential build, regardless of the thread count.
 * </p>
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *

            }

            @Override
            public int size() {
                return (int) properties.entrySet().stream()
                        .filter(PropertiesAsMap::matches)
                        .count();
            }
        };
    }

    private static boolean matches(Entry<Object, Object> entry) {
        return entry.getKey() instanceof String && entry.getValue() instanceof String;
    }